Cylinder head for a motor compressor unit

ABSTRACT

A cylinder head for a motor-compressor unit comprising a casting defining an inner cavity which has upper and lower sections separated by a transverse baffle member. An orifice in the transverse baffle member communicates the upper section with the lower section. The lower section is separated into an outer portion and an inner portion by a second baffle member having a transverse portion, a longitudinal portion and an arcuate portion of about 270* connecting the transverse and longitudinal portions. The outer portion of the lower cavity is provided with alternate relatively restricted and relatively expanded areas for attenuating the sound produced by the pulsating flow of the suction gas. The inner portion receives gas discharged from the cylinder.

United States Patent Ingalls et al.

[ 1 CYLINDER HEAD FOR A MOTOR COMPRESSOR UNIT Douglas J. lngalls; Richard S. Abell, both of Cazenovia, N.Y.

Assignee: Carrier Corporation, Syracuse, NY. Filed: June 1, 1972 Appl. No: 258,644

Related US. Application Data Continuation of Ser. No. 96,824, Feb. 10, 1970, abandoned.

[75] Inventors:

[56] References Cited UNITED STATES PATENTS 3/1970 Hover 417/902 X 3,504,762 4/1970 Valbjorn et a1... 181/56 X 3,698,840 10/1972 Hover 181/56 X FOREIGN PATENTS OR APPLICATIONS 216,897 4/1967 U.S.S.R 181/40 [11] 3,817,661 June 18, 1974 1,358,426 3/1964 France 417/312 Primary Examiner-Carlton R. Croyle Assistant Examiner-Richard Sher Attorney, Agent, or Firm.l. Raymond Curtin; Barry E. Deutsch [5 7] ABSTRACT A cylinder head for a motor-compressor unit comprising a casting defining an inner cavity which has upper and lower sections separated by a transverse baffle member. An orifice in the transverse baffle member communicates the upper section with the lower section. The lower section is separated into an outer portion and an inner portion by a second baffle member having a transverse portion, a longitudinal portion and an arcuate portion of about 270 connecting the transverse and longitudinal portions. The outer portion of the lower cavity is provided with alternate relatively restricted and relatively expanded areas for attenuating the sound produced by the pulsating flow of the suction gas. The inner portion receives gas discharged from the cylinder.

6 Claims, 2 Drawing Figures PKTE'N'TEDJun 1-8 mm 8:8 i Tli sum 2 or 2 INVENTORS DOUGLAS J. ING S RICHARD S. ABE

ATTORNEY 1 CYLINDER HEAD FOR A MOTOR COMPRESSOR UNIT This is a continuation, of application Ser. No. 96,824 filed Dec. 10, 1970 now abandoned.

BACKGROUND OF THE INVENTION Theutilization of hermetic motor-compressor units for small air conditioning applications, such as room units, has proven to be highly acceptable and satisfactory.

It is an object of this invention to provide a unique cylinder head which integrally incorporates suctiongas muffling meansythereby achieving desirable compactness without adversely affecting the sound attenuating characteristics of the motor-compressor unit.

SUMMARY OF THE INVENTION This invention relates to hermetic motor-compressor units which includesnovel muffling means.

The muffling means comprise a cylinder head having a casting which defines an inner cavity having upper and lower sections separated 'by a transverse baffle member. Refrigerant gas to be compressed is supplied through an inlet into the upper section of the inner cavity. An orifice in the transverse baffle member provides for the flow of refrigerant gas from the upper section into the lower section.

The lower section is separated into an outer portion and an inner portion by a second baffle member having a transverse portion, a longitudinal portion and an arcuate portion of about 270 connecting the transverse and longitudinal portions. The outer portion of the lower cavity is provided for receiving suction gas and has alternate relatively restricted and relatively expanded areas for attenuating the sound produced by the pulsating flow of the suction gas. The inner portion is provided for receiving gas discharged from the cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a motor-compressor unit including the cylinder head in accordance with our invention; and

2 illustr sse gsrsri zti usmfl lzq liElsi.

head.

DESCRIPTION OF THE PREFERRED EMBODIMENT and a compressor generally indicated at 17 are disposed within shell 11. Compressor 17 is axially aligned with motor 15 and'is disposed therebelow.

The motor-compressor unit 10 is suspended within shell 11. A preferred suspension system is described in copending application Ser. No. 96,825, filed Dec. 10, 1970, now US. Pat. No. 3,689,207 in the names of Richard S. Abel] and George T. Privon.

Motor 15 includes stator 18 and rotor 20, the rotor being operably connected to drive crankshaft 22. The crankshaft is supported within compressor body 24 of compressor 17.

The compressor body defines the cylinders 27 of the compressor. Closing the cylinders are the cylinder heads 26 and 28 to be more fully described hereinafter. The cylinder heads are secured to the compressor body by means such as screws 25. Pistons 46 are disposed within cylinders 27 for reciprocal movement therein. Any desired number of cylinders may be employed. Connecting the pistons to the eccentric portion of the crankshaft 22 are connecting rods '42 and wrist pins 44. The desired reciprocating movement of the pistons is obtained by rotation of the crankshaft as is obvious to those skilled in the art.

Referring now to FIG. 2, there is shown a perspective view of a cylinder head in accordance with our invention. The cylinder head includes a semi-elliptically shaped cast member 51. The interior surface of cast member 51 defines the interior cavities of the cylinder head.

lntegrally formed with member 51 is transverse baffle member 52. Baffle member 52 separates the interior cavity of the cylinder head into upper and lower sections, respectively, 53 and 54.

Conduit 30 is provided for delivering suction gas to be compressed by the operation of the compressor into the upper cavity 53. A plate member 50, shown in FIG. I, is provided to seal off upper cavity 53. Plate 50 is secured to the cylinder head by means such as screws 55, shown in FIG. 1.

Transverse bafile member 52 includes orifice 56, provided to communicate upper cavity section 53 with lower cavity section 54. Orifice 56 includes tubular member 57 to further increase the effective length of the orifice for improved sound attenuation performance.

The lower cavity section is provided with a baffle member 58 which separates the lower cavity into a first portion 62 and a second portion 63.

Baffle member 58 is integrally formed with member 51. In a preferred embodiment, baffle member 58 includes a first transverse portion 59, a second longitudinal portion 60, and an arcuate portion 61 of approximately 270, connecting the first and second portions.

Section 54 includes a number of relatively restricted sections or areas 65 and 66 and several relatively expanded areas or sections 63', 63" and 63". By having serially connected relatively restricted and expanded areas, improved sound attenuation is obtained for the sound produced by the pulsating flow of the suction gas.

The hermetic motor-compressor unit embodying our invention is typically employed in a mechanical refrigeration system. The refrigerant gas to be compressed enters into the shell of the compressor via line 29. The gas passes through inlet 29 and screen 31 and thereafter flows over the windings of motor 15 to cool the same in a manner well known to those skilled in the art. Screen 31 is included to separate any undesirable solid particles that may be entrained in the entering refrigerant gas.

The refrigerant gas, after having cooled the windings of the motor, enters into the compressor portion of'the unit via inlet tubes'30- and 32 disposed in the top portion of cylinder heads 26 and 28. Due to the pulsating characteristic of the flow of the suction gas into the cylinder heads, it is desirable to attenuate the sound produced by such pulsating flow. The gas entering into the cylinder heads passes initially into upper cavity 53, which has a substantially greater area than does conduit 30. By expanding the gas into upper cavity 53, a portion of the pulsating characteristic is reduced, thereby attenuating a portion of the sound produced thereby.

The gas then flows through member 57 disposed in orifice 56 into lower cavity section 54. Orifice 56 and member57 present a further restricted passage for the gas to flow through, before it is re-expanded in portion 63 of section 54.

As noted hereinabove, lower cavity section 54 includes a plurality of serially connected relatively restricted and expanded areas. For example,-the gas entering into section 54 may pass through restricted portion 65 into expanded portion 63', as shown by one of the arrows in FIG. 2. Alternatively, the gas may flow through restricted portion 66 into a second expanded portion 63", or as a third alternative, the gas may collect in expanded portion 63". By providing the plurality of alternate restricted and expanded areas, the pulsating characteristic of the flow of the suction gas is substantially eliminated, thereby attenuating the sound produced thereby as is desired.

The refrigerant gas enters each of the cylinders 27 of the compressor via the suction ports (not shown) which are formed in valve plate 33, as shown in FIG. 1. The ports are preferably aligned with the expanded areas of the lower cavity section. The gas, after it is compressed by operation of the piston, enters into portion 62 of the cylinder heads through discharge ports 48' formed in the valve plate 33 which are aligned with portion 62. Discharge valve 48, connected to valve plate 33, regulates the flow of gas from the cylinder.

The discharged, high presure gas passes through internal bores of compressor body 24 in a manner which is more fully explained in copending application Ser. No. 96,792, filed Dec. 10, 1970 now US. Pat. No. 3,785,453, in the names of Harvey G. Stenger, George T. Privon and Salvatore Buonocore. Undesirable sound produced by the pulsating nature of the discharge gas is attenuated by passing through the internal bores of the compressorbody. The gas thereafter flows into discharge line 34 which connects with discharge outlet 70 provided for transmitting the compressed gas to the other components of the refrigeration system.

With respect to providing the necessary lubrication for the unit, oil is stored in sump 39 of the compressor which is defined by lower shell section 14. Oil pickup tube 38 extends into the sump so as to have its inlet below the surface of the oil. The tube is press fitted into an appropriate aperture formed in the bottom of crankshaft 22. Thrust bearing 41 journals tube 38. During normal operation, rapid rotation of the tube, caused by rotation of the crankshaft produces a vacuum at the tubes inlet, causing oil to flow thereinto. Internal bores (not shown) formed eccentrically relative to the center line of the crankshaft, provide the necessary force for supplying the lubricating oil to the bearing surfaces, such as bearing 43 formed in bearing cap 45. Transverse bores (not shown) communicate with the internal bores of the crankshaft for supplying the oil therefrom to the external bearing'surfaces. Grooves 47 are provided on the outer surface of crankshaft 22 for the flow of oil to bearings 43 and 49. i

The novel cylinder head disclosed herein provides an efficient muffling means for attenuating the sound produced by the pulsating flow of the suction 'gas. By forming the muffling means integrally with the cylinder head, desired compactness for the motor-compressor unit may be maintained, without adversely affecting the sound attenuating quality of the unit.

While we have described and illustrated a preferred embodiment of our invention, it is to be understod the invention is not limited thereto, but may be otherwise embodied within the scope of the following claims.

We claim:

1. In a hermetic motor compressor unit including a compressor body, a crankshaft disposed within the compressor body for'rotation therein, a piston disposed in a cylinder and connected to an eccentric portion of the crankshaft by a connecting rod and a wrist pin, the invention which comprises a cylinder head for the cylinder having integrally formed suction gas muffling means comprising:

a a member having a wall whose interior surface defines a cavity;

b a transverse baffle member separating the cavity into a first and a second section;

c. means defining a suction gas inlet into the first section;

(1. means defining an orifice through said transverse baffle member, to communicate said first section with said second section; and

e a second baffle member disposed in said second section and separating the second section into first and second portions, said second baffle member comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270 connecting said transverse and longitudinal portions, said first portion of said second section receiving suction gas supplied from said first section through said orifice, and said second portion of said second section receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate, relatively restricted and relatively expanded areas to attenuate the sound caused by the pulsating characteristic of the suction gas.

2. The combination in accordance with claim 1 wherein said transverse portion and said longitudinal portion form aconnection between said arcuate portion and the interior wall of said member, said second baffle member further comprising a second transverse portion and a second longitudinal portion interconnected with said arcuate portion between said longitudinal portion and said transverse portion, said means defining an orifice through said transverse baffle member providing communication between said first section and the portion of said second section between said second longitudinal portion and said second transverse portion, said second transverse portion and said second longitudinal portion terminating adjacent to and spaced from the interior wall of said member to allow passage of gas from between said second transverse portion and said second longitudinal portion into the area defined by said transverse portion and said second longitudinal portion and the area defined by said longitudinal portion and said second transverse portion.

3. A cylinder head for use in a hermetic motor compressor unit comprising:

a a member having a wall whose interior surface defines a cavity;

I b a transverse baffle member separating the cavity into a first section and a second section;

means defining a suction gas inlet into the first section;

d means defining an orifice through said transverse baffle member, to communicate said first section with said second section; and

e a second baffle member disposed in said second section and separating said second section into first and second portions, said second baffle member comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270 connecting said transverse and longitudinal portions, said first portion of said second section receiving suction gas supplied from said first section a through said orifice, and said second portion of said second section receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate, relatively restricted and relatively expanded areas to attenuate the sound caused by the pulsating characteristic of the suction gas.

4. A cylinder head in accordance with claim 3 wherein said transverse portion and said longitudinal portion form a connection between said arcuate portion and the interior wall of said member, said second baffle member further comprising a second transverse portion and a second longitudinal portion interconnected with said arcuate portion between said longitudinal portion and said transverse portion, said means defining an orifice throughsaid transverse baffle member providing communication between said first section and the portion of said second section between said second longitudinal portion and said second transverse portion, said second transverse portion and said second longitudinal portion terminating adjacent to and spaced from the interior wall of said member to allow passage of gas from between said second transverse portion and said second longitudinal portion into the area defined by said transverse portion and said second longitudinal portion and the area defined by said longitudinal portion and said second transverse portion.

5. A cylinder head for use in a hermetic motor compressor unit comprising:

a. a member having a wall whose interior surface defines a cavity;

b. means defining a suction and c a baffle member disposed in said cavity and separating said cavity into first and second portions, said baffle member comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270 connecting said transverse and longitudinal portions, said first portion of said cavity receiving suction gas supplied from said suction gas inlet and said second portion of said cavity receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate relatively restricted and relatively expanded areas to attenuate sound caused by the pulsating characteristic of the suction gas.

6. In a hermetic motor compressor unit including a compressor body, a crankshaft disposed within the compressor body for rotation therein, a piston disposed in the cylinder and connected to an eccentric portion of the crankshaft by a connecting rod and a wrist pin, the invention which comprises a cylinder head for the cylinder having integrally formed suction gas muffling means comprising:

a a member having a wall whose interior surface defines a cavity;

b means defining a suction and c a baffle member disposed in said cavity and separating said cavity into first and second portions,

said baffle memer comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270 connecting said transverse and longitudinal portions, said first portion of said cavity receiving suction gas supplied from said suction gas inlet, and said second portion receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate, relatively restricted and relatively expanded areas to attenuate sound caused by the pulsating characteristic of the suction gas.

gas inlet into said cavity;

gas inlet into said-cavity; 

1. In a hermetic motor compressor unit including a compressor body, a crankshaft disposed within the compressor body for rotation therein, a piston disposed in a cylinder and connected to an eccentric portion of the crankshaft by a connecting rod and a wrist pin, the invention which comprises a cylinder head for the cylinder having integrally formed suction gas muffling means comprising: a a member having a wall whose interior surface defines a cavity; b a transverse baffle member separating the cavity into a first and a second section; c. means defining a suction gas inlet into the first section; d. means defining an orifice through said transverse baffle member, to communicate said first section with said second section; and e a second baffle member disposed in said second section and separating the second section into first and second portions, said second baffle member comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270* connecting said transverse and longitudinal portions, said first portion of said second section receiving suction gas supplied from said first section through said orifice, and said second portion of said second section receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate, relatively restricted and relatively expanded areas to attenuate the sound caused by the pulsating characteristic of the suction gas.
 2. The combination in accordance with claim 1 wherein said transverse portion and said longitudinal portion form a connection between said arcuate portion and the interior wall of said member, said second baffle member further comprising a second transverse portion and a second longitudinal portion interconnected with said arcuate portion between said longitudinal portion and said transverse portion, said means defining an orifice through said transverse baffle member providing communication between said first section and the portion of said second section between said second longitudinal portion and said second transverse portion, said second transverse portion and said second longitudinal portion terminating adjacent to and spaced from the interior wall of said member to allow passage of gas from between said second transverse portion and said second longitudinal portion into the area defined by said transverse portion and said second longitudinal portion and the area defined by said longitudinal portion and said second transverse portion.
 3. A cylinder head for use in a hermetic motor compressor unit comprising: a a member having a wall whose interior surface defines a cavity; b a transverse baffle member separating the cavity into a first section and a second section; c means defining a suction gas inlet into the first section; d means defining an orifice through said transverse baffle member, to communicate said first section with said second section; and e a second baffle member disposed in said second section and separating said second section into first and second portions, said second baffle member comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270* connecting said transverse and longitudinal portions, said first portion of said second section receiving suction gas supplied from said first section through said orifice, and said second portion of said second section receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate, relatively restricted and relatively expanded areas to attenuate the sound caused by the pulsating characteristic of the suction gas.
 4. A cylinder head in accorDance with claim 3 wherein said transverse portion and said longitudinal portion form a connection between said arcuate portion and the interior wall of said member, said second baffle member further comprising a second transverse portion and a second longitudinal portion interconnected with said arcuate portion between said longitudinal portion and said transverse portion, said means defining an orifice throughsaid transverse baffle member providing communication between said first section and the portion of said second section between said second longitudinal portion and said second transverse portion, said second transverse portion and said second longitudinal portion terminating adjacent to and spaced from the interior wall of said member to allow passage of gas from between said second transverse portion and said second longitudinal portion into the area defined by said transverse portion and said second longitudinal portion and the area defined by said longitudinal portion and said second transverse portion.
 5. A cylinder head for use in a hermetic motor compressor unit comprising: a. a member having a wall whose interior surface defines a cavity; b. means defining a suction gas inlet into said cavity; and c a baffle member disposed in said cavity and separating said cavity into first and second portions, said baffle member comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270* connecting said transverse and longitudinal portions, said first portion of said cavity receiving suction gas supplied from said suction gas inlet and said second portion of said cavity receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate relatively restricted and relatively expanded areas to attenuate sound caused by the pulsating characteristic of the suction gas.
 6. In a hermetic motor compressor unit including a compressor body, a crankshaft disposed within the compressor body for rotation therein, a piston disposed in the cylinder and connected to an eccentric portion of the crankshaft by a connecting rod and a wrist pin, the invention which comprises a cylinder head for the cylinder having integrally formed suction gas muffling means comprising: a a member having a wall whose interior surface defines a cavity; b means defining a suction gas inlet into said cavity; and c a baffle member disposed in said cavity and separating said cavity into first and second portions, said baffle memer comprising a transverse portion, a longitudinal portion, and an arcuate portion of approximately 270* connecting said transverse and longitudinal portions, said first portion of said cavity receiving suction gas supplied from said suction gas inlet, and said second portion receiving high pressure gas after it has been compressed by the operation of the motor compressor unit, said first portion having alternate, relatively restricted and relatively expanded areas to attenuate sound caused by the pulsating characteristic of the suction gas. 